Content transmission device and a content reproducing apparatus

The present invention realizes streaming reproduction in an environment in which a communication speed changes due to a change in the position of a moving body such as a vehicle. A content reproduction device 10 includes: a plurality of communication units (a cellular phone 101 and a wireless LAN communication unit 104), each receiving a content transmitted in segments from a content transmission device over a communication path; a content reconstruction unit 113 that has a buffer 1130 in which each segmented data of the content received by each of the communication units is temporarily accumulated, and that reconstructs each segmented data accumulated in the buffer 1130 into the content; a reproduction unit 114 that reproduces, at a predetermined bit rate, the content reconstructed by the content reconstruction unit 113; and a communication control unit 110 that: calculates, for every predetermined time, target transmission speeds to be assigned for content reception performed by the respective communication units, based on free space in the buffer 1130 and the bit rate; and transmits a first request signal indicating the calculated target transmission speeds to the content transmission device via one of the communication units.